Piston pump with cam coupling and crank assembly



s. ROSEN 2,978,283 PISTON PUMP WITH CAM COUPLING AND CRANK ASSEMBLY April 4, 1961 2 Sheets-Sheet 1 Filed Sept. 22, 1959 SIDNEY ROSEN INVENTOR.

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April 4, 1961 s. ROSEN 2,978,283

PISTON PUMP WITH CAM COUPLING AND CRANK ASSEMBLY Filed Sept. 22, 1959 2 Sheets-Sheet 2 i /0 as as /6 as FIG. 2. I

I I 46 I 20 F 58 52 5 I00 MW '54 SIDNEY ROSE/V I04 INVENTOR. x [44 I46 1 130 I58 ATTORNEY United States Patent 2,978,283 PISTON PUMPWITH CAM COUPLING AND CRANK' ASSEMBLY This invention relates generally topump apparatus. More particularly; this invention pertains to a' demountablegdlspensing pump arrangement having a calibrated stro'ke'.

For sanitary; health or chemical purity reasons, pumped fluids, such as milk, must often be protected from com tamlnation tli'ereof. i and non-deteriorating gaskets is widely understood as good practlce in these circumstances. When the puinp must notonly move the fluid but also dispense it in measured amounts, it is difiicult to reconcile the need for quick dis assembly with retention of accurate calibration.

It 1s an object of the present invention, therefore, to provide a; calibrated dispensing pump which can easily and quickly be disassembled for" cleaning or inspection.

Another object or this invention is to provide a calibrated dispensing pump arrangement having a minimum of parts which can be reduced to its elemental components With less han one-quarter turn or an assembly.

Stillanother object of this invention ist o provide a de mountable dispensing pump which exposes no pipe threads or' similar difli'cnlt-to-clean crevices fluid I 7 To provide ready access tothe pump for demounting purposes by use of hinged and cammed fasteners, is yet another object of the present invention. H r

To provide a newtype of calibrated dispensing 'pump is economicalto manufacture, efiicient and reliable in operational use and which iseasy to install and maintain, are other objects of this invention.

b These and other objectsand advantages of this invention will bec'ome more readily apparent and understood from the accompanying specification and drawings in to the transported hi h. .7. E M

Fig. 1 is a perspectivejview of a calibrated dispensing pu np incorporating features of this invention;

Fig. 2 is a cross-section taken along line 2+2 or Fig. 1

Fig. 3 is a side view of the valve attaching arrangement; Fig. 4 is a cross-section taken along line 44 of Fig. 3;

Fig. 5 is a cross-section taken along line 5-5 of Fig. 1 and Fig. 6 is a cross sectio'n taken along line 6--6 of Fig. 2.

Referring now to Fig. 1 of the drawings, thereis shown generally a cylinder-and-pi'ston type calibrated dispensing pump 10. The ump 10 is provided with a tubular cylind'er12 upon which" is mounted an up per cylinder head as sembly 14 and a lower cylinder head assembly 20. p p

The u per cylindefhea'd assembly 14 of the 10 mounts an intake valve 16, and an outlet valve 18 at one side thereof.. The cylinder 12 is provided with spaced circumferential flang'es'zz' neareah end, :Both flanges 22 have four equally sp'aeeu notches orscal lops 24 cut into their peripheries, as best illustrated in Fig. 4. A chambered cam face 26 is formed on the inner side of each flange 22 adjacent to the right edge of each scallop 24. A rotation limiting stop pin 28 is set into each flange 22.

The upper cylinder head assembly 14 consists of a thick square block 30 which has centered upon its underface an The use of stainless steel or the like.

Patented Apr. 4, 1961 annular groove 32, as shown in Fig. 2. This groove 32 is dimensioned to seat a resilient O ring gasket 34 and the end of the cylinder 12 thereagainst.

A large deep bore 36, concentrically arranged with re spect to groove 32, but of slightly smaller diameter, is provided in the block 30. This large bore 36 commum' cates by a passage or cross bore 40 with a small bore 37 drilled vertically through a projecting arm 38 at one side of the block 30.

As best shown in Figs. 3 and 4, an upper lock pin 42 is provided in each corner of the square block 30. Notches- 44 are cut approximately halfway into the sides of the pins 42 to receive the flange 22 and urge the end of cylinder 12 against the previously mentioned 0 ring gasket 34.

The lower cylinder head assembly 20 consists of a square head 46, as shown in Figs. 1 and 2. Head 46 is provided with a centered annular recess 48 into which the lower end of cylinder 12 fits against a resilient gasket 50. A plurality of air exhaust ports 52 are provided to the atmosphere from the recess 48. A centered boss 54 with an internal. sleeve 56 serves as a bearing for the piston rod 100. Each corner of the head 46 is provided with a pressed-in lower lock pin 58, each having a flange receiving notch 60 to urge the lower end of the cylinder 12 tightly against the gasket 50.

Referring now to the details of the valves 16 and 18 and their mounting, Fig. .2 illustrates that the small bore 37 in the projecting arm 38 is provide-d with counterbored recesses .62 coaxial therewith on both ends. These re cesses 62 are adapted to receive 0 ring seals 64. The

intake valve 16 mounts against the lower 0 ring seal 64, and it consists of a lower hose fitting and valve seat 66 containing a ball 68 and a lower weight 70.

The upper or outlet valve 18 is provided in two parts, namely, an upper valve seat body 72 and an upper hose fitting 8'2 mated and gasketed together. This assembly contains a ball 74 and an upper weight 76.

Both the upper and lower weights 70 and.76, respectively, are made of lengths of square rod and have milled upper ends to provide cruciform notches therein.

Both the lower and upper hose fittings 66 and 82, respectively, are provided with a flange 84 having a pair of diametricallyopposing flats 86, as shown in Figs. 1, 3, 4, and 6. The flanges 84 are formed with rounded corners 88 where they intersect with the flats 86 somewhat like the crowning of a square or hexagonal nut.

In conjunction with wrenching flats 90 provided in both hose fittings 66 and 82, these rounded corners 88 act as camming surfaces against flanges or fingers 94 of a pair of locking bars 92. The locking bars 92 are positioned with pins 93 and are soldered to the sides The piston rod is reciprocated by a similar hinged lowerfitting 104 whi brated adjustable drive crank assembly 106.

The drive crank assembly 106, as shown in Figs. 1 and 5, consists of a crank body or lever 108 which has a lengthwise ruled scale 109 thereon. A slot 110 is milled through the lever 108 to provide longitudinal ways 112. An unthreaded hole or aperture 114 is drilled into one end of the lever 108. A stub crankshaft 116 is seh is removably attached to a can 3 cured by recessed cap screws 120 through a flange 118 to the other end of the lever 108. A fixed indexing washer 122, having a fiducial mark is provided at the drilled end of the crank assembly 106 against which a calibrated thumb screw head 124 bears. l 1

This thumb screw head 124 is secured by means' of a set screw 126 to a threaded micrometer screw 128. A threaded lock bolt 130 is provided with a threaded hole 134 near its shank end for the micrometer screw 128. The shank end also has a flat-sided head 132 which is retained by'the ways 112. A flat indexing washer 136 having a fiducial mark for the scale 109 fits over the shank of the lock bolt 130' and bears against the side of the lever 108 as urged by a coiled spring 142 and collar 140 within a hollow spacer body 138. v

The body 138 is provided with a reduced neck 144 which acts as a crank pin." The oil containing bearing is pressed into the circumferentially grooved rotating sleeve 148. This assembly is then free to rotate over the reduced neck 144. A flat washer 150 is also provided, which seats a knurled locknut 152, on the threaded lock bolt 130 to retain the calibrated crank radius indicated on the scale 109 and set by the thumb screwhead 124.

As best shown in Fig. 2, the lower fitting 104 (and similarly the upper fitting 102) is provided with a quick disconnect feature consisting of an eccentric camming bolt 156 passed'crosswise therethrough and interfering with the grooved portion of the sleeve 148. When the bolt 156 is rotated, a relieved portion 158 releases the interference of theparts for disassembly thereof. A snap ring 160 prevents the loss of the bolt 156.

' A hinge pin 154 allows the pump to readily be swung away from its mountings when either fitting 102 or 104 is disconnected.

. A quarter turn of the cylinder 12 on its heads 14 and 20 serves to release it, and the scallops 24 free the flanges 22 from their engaging lockpins 42 and 58.

Quarter turns of the hose fittings 66 and 82 expose the components of the valve in like easy fashion and after cleaning and re-assembly all parts of the pump 10 are precisely replaced without loss of the calibrated dispensing stroke of the piston.

While but one construction of the invention has been illustrated in the drawings and described herein, it is not intended to limit the design and manufacture of the pump to such particular form, as it is appreciated that other structures of the pump could be designed and made that would use the same principles and come within the scope of the appended claims.

What is claimed is:

1. A twist lock, comprising, structure defining a housing, a head for said housing, and means. for rapidly coupling and uncoupling said head to and from said housing, respectively, said means consisting of a plurality of spaced side-notched pins secured to said head, a ramp flange formed on one end of said housing, said ramp flange having a corresponding number of spaced escape notches formed therein, whereby when .said head is coupled to said housing, said side-notched pins capture said ramp flange thereof, with said escape notches being utilized for clearing said pins for uncoupling of said head from said housing. 7 a

2. A twist lock arrangement, comprising, structure defining a cylinder, a head for opposite ends of said cylinder, and means for rapidly coupling and uncoupling each said head to and from its respective end of said cylinder, respectively, each said means consisting of a plurality of .4 spaced side-notched pins secured to its respective head, a ramp circumferentially arranged flange at each end of said cylinder, each said ramp flange having a corresponding number of spaced escape notches formed therein for its respective head, whereby when said head is coupled to said cylinder, said side-notched pins of each head capture the ramp flange of its respective head, with said escape notches of the flanges being utilized for clearing the pins of its respective head for quick uncoupling thereof from said cylinder.

,3. A twist lock arrangement as recited in claim 2, wherein each said head is provided with an annular groove, and a torroidal shaped packing ring in each said groove, each said torroidal shaped packing ring providing a line seal for its respective end of said cylinder as well as compressive force to hold each said means from turning.

4. A head assembly for a pump arrangement having a tubular cylinder with a piston therein and a piston rod and having a passageway communicating with said cylinder for a fluid to be pumped to and from said cylinder, said head assembly comprising a circumferential arranged flange positioned near one end of said cylinder, said flange having a plurality of spaced scallops cut into its peripheral edge, each said scallop having a chambered cam surface in the corresponding edge of each scallop, a head for said cylinder, said head having a number of lock pins corresponding in number to said scallops on its cylinder flange, each said lock pin having a notch cut into its side to receive a portion of its flange at the end of the cylinder when said head is assembled to said cylinder, the notched portions of said pins being arranged to be inserted through said scallops and to extend over said flange so as to lock said head to said cylinder by approximately a quarter turn of said cylinder.

5. A head assembly arrangement for a dispensing pump having a tubular cylinder with a piston and piston rod and a passageway communicating with said cylinder for a fluid to be drawn into and pumped from said cylinder, said head assembly arrangement comprising a circumferentially arranged flange near each end of said cylinder, each said flange having a plurality of equally spaced scallops cut into its peripheral edge, each said scallop having a chambered cam surface formed in the corresponding edge of each scallop, an upper cylinder head for said cylinder, a lower cylinder head for said cylinder, each of said upper and lower heads having a number of lock pins corresponding in number to said scallops on its respective cylinder flange, each said lock pin having a notch cut into its side to receive a portion of its respective flange at the ends of the cylinder when said upper and lower heads are assembled to said cylinder, the notched portions of said pins being arranged to be inserted through said scallops and to extend over said flanges so as to lock said upper and lower heads to said cylinder when said heads are rotated with respect thereto.

References Cited in the file of this patent UNITED STATES PATENTS Rosen Oct. 6, 1959 

